The function f(x)=90e−0.3x+10 describes the percentage of​ information, f(x), that a particular person remembers x weeks after learning the information.
a.
Substitute 0 for x​ and, without using a​ calculator, find the percentage of information remembered at the moment it is first learned.
b.
Substitute 1 for x and find the percentage of information that is remembered after 1 week.
c.
Find the percentage of information that is remembered after 12 weeks.
d.
Find the percentage of information that is remembered after one year​ (52 weeks).